The objective of the challenge is to arrest 10 thieves in the cities of New Urbem and Municiberg. Thieves appear randomly in neighborhoods. Fly over the neighborhoods until you see 1 red dot on the mini-map (picture1). Seeing you, the thief flees: catch him and handcuff him (picture2). Then return the stolen object to its owner to validate a part of the challenge (picture3). Repeat the process until you reach your goal.